Docking poses of 13e, 13a, 13c, and reference compound B. Panel A. Docking poses of compounds B (magenta), 13e (dark green), 13a (light blue), and 13c (orange). Co-crystallized MSACK is shown in yellow sticks. Residues within 4 Å of the co-crystallized ligand are visible. Panel B. Docking pose of compound 13e. Panel C. Docking pose of compound 13a. Panel D. Docking pose of compound 13c. For Panels B-D residues within 4 Å of the pose are visible.